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저온 소성한 MgO 분말을 함유한 플라이애시 콘크리트의 장기재령에서의 내구특성
장봉석,최슬우,이광명,Jang, Bong-Seok,Choi, Seul-Woo,Lee, Kwang-Myong 대한토목학회 2013 대한토목학회논문집 Vol.33 No.3
저온에서 소성된 산화마그네슘 분말을 치환한 MgO 콘크리트는 장기적인 팽창성을 가진다. 또한 MgO의 수화반응이 느린 속도로 장기재령까지 일어나기 때문에 매스콘크리트의 온도수축을 효과적으로 보상할 수 있다. 따라서 저온 소성한 MgO는 매스콘크리트 구조물인 댐에 주로 적용되었다. 최근 수화열 저감을 위해 매스콘크리트에 많이 사용되는 플라이애시를 사용한 MgO 콘크리트의 팽창특성에 대한 연구가 진행되어 왔지만 이러한 콘크리트의 내구성에 관한 연구는 부족한 실정이다. 이 연구에서는 플라이애시 콘크리트에 저온 소성한 MgO 분말을 치환하여 MgO 분말 치환에 따른 장기재령에서의 내구특성을 확인하였다. 재령 360일까지 20, $50^{\circ}C$에서 수중 양생을 실시한 후 탄산화, 동결융해 및 염화물 확산, 황산염 침투 저항성을 평가하였다. 실험결과, MgO 분말을 치환한 시편에서 탄산화 저항성 및 염해 저항성, 황산염 침투 저항성이 다소 향상되는 것을 확인하였다. 반면 동결융해 저항성은 MgO 분말 치환에 거의 영향을 받지 않았다. Concrete containing lightly burnt MgO has long term expansibility. It also could compensate for the thermal shrinkage of mass concrete, because the hydration of MgO proceeds at a slow pace to long-term age. Thus, lightly burnt MgO has been applied to the construction of mass concrete such as dams. Recently, the expansion characteristics of MgO concrete with fly ash that could be applied to mass concrete for the reduction of hydration heat have been studied and however, limited studies on its durability. This study investigates the long-term durability characteristics of fly ash concrete with lightly burnt MgO. The durability tests on carbonation, freezing-thawing, diffusion of chloride, and resistance to sulfate attack were carried out for MgO concrete with curing for 360 days in submerged condition with different temperature of 20 and $50^{\circ}C$. The results reveal that MgO concrete shows a greater resistance of carbonation, diffusion of chloride, and resistance to sulfate attack. On the other hand the resistance of freezing-thawing was little influenced by MgO powder.
노인장기요양보험 시행 이후 노인복지법의 역할에 관한 소고
장봉석 ( Bong Seok Jang ) 전북대학교 법학연구소 2011 法學硏究 Vol.32 No.-
Long term care insurance plan has been successfully enforced in many ways, such as an increase number of recipients of the service and improvement of the qualify of elderly`s life etc. On the other hand, in the perspective of the elderly welfare law, the enforcement of the plan has to solve the newly rised problem about the blind spot as well as to lead the various and extensive role on preventive and complementary part of the service. Nonetheless, present elderly welfare law does not adequately cope with these kind of problems. To solve these problems, relationship between two parties has to be clearly defined according to the aim and the purpose of the law and based on that, following problems, such as the scope of the recipients, details of the service, comparison with other countries, and financial matter has to be examined and ultimately, through the revision of the senior welfare law enforcement regulations, current law will be complemented and appropriately applied so that the long term care insurance will be successfully established.